It acts like an underground welfare system!

它就象是一个地下福利系统！

This traffic problem led to the development of the underground system.

交通的这些问题引领了地铁系统的发展。

And talking to them on an underground, underwater radio communications system.

并借助于水下无线电通讯系统与他们联系。

This street is the first in the city to have an underground sewer system.

这条街是纽约 第一条有下水道系统的街道。

It has the distinction of being the oldest and most complex underground system in the world.

它因是世界上最古老和最复杂的地铁而著名。

However, building projects for underground train systems in Hanoi and Ho Chi Minh City have had repeated delays.

然而，在河内和胡志明市建设地铁系统的项目一再推迟。

So why not take a trip on the oldest underground system today?

所以今天为什么不乘坐一下最古老的地铁系统呢？

Housing up to 300 mole rats, these colonies feature complex underground tunnel systems, nest chambers, and community bathrooms.

一个巢穴居住着最多 300 只裸鼹鼠，这些群落以地下管道系统为显著特征，还有像大厅一样的巢穴以及公共厕所。

The London underground system is working to transport huge numbers of people as it has done for many years.

伦敦地铁系统致力于运输大量乘客，正如同它这些年一直在做的一样。

The network of the underground system includes twelve lines and now goes twenty-six miles out of central London.

地铁系统网包括12条线路，并且现在开到了伦敦中心外26英里。

Well, in underground systems there are natural discharge points—places where the water flows out of the underground systems, out to lakes and streams.

在地下体系中有自然的排放点——那些水从地下体系流出进入湖泊和溪流的地方。

The team accidentally found the artifacts while exploring Chichen Itza in an effort to learn more about its underground water system.

该团队在探索奇琴伊察时意外发现了这些文物，当时他们正在努力了解奇琴伊察的地下排水系统。

This street is the first in the city to have an underground sewer system.

这条街是本市第一条有下水道系统的街道。

This street is the first street in the city to have an underground sewer system.

这条街是纽约第一条有下水道系统的街道。

You can think of it as an underground subway system, where each root is a station, where resources are loaded and unloaded.

你可以把它想成地下铁系统，每个根是一个站，在那里资源被装载和卸载。

The underground system diverted 12 million cubic meters of water and prevented an estimated $1.7 billion in damage.

该地下系统分流了 1200 万立方米的水，避免了约 17 亿美元的损失。

And the recharge rate doesn't change, so the result is we've reduced the amount of water that's stored in the underground system.

而水的补充率没有改变，所以结果是我们减少了储存在地下体系中的水量。

A " sewer" (sewer) is part of an underground system that carries water and waste away from houses and buildings.

“下水道”（下水道）是将水和废物从房屋和建筑物中带走的地下系统的一部分。

And so it just pushes this system underground, and so … ROBERT: And that way it's a lot like abortion.

所以它只是将这个系统推入地下，所以… … 罗伯特：这样就很像堕胎了。

In 1868, the next section of the underground system was opened in the south of London by another company called the Metropolitan District Railway.

1868年，首都地方铁路在伦敦南部开放了地铁的下一段。